Discrete OP1-BP – a truly transparent, discrete operational amplifier module.
A NEW I/V CONVERSION AND OUTPUT STAGE FOR WEISS FLAGSHIP MEDEA+ DIGITAL TO ANALOGUE CONVERTER
Superb noise performance:
- 1nV/√Hz voltage noise density (1kHz)
- 30nVpp voltage noise (0.1-10Hz)
- 0.7pA/√Hz current noise density (1kHz)
- 80pApp current noise (0.1-10Hz)
- no common-mode current noise from bias cancellation
Outstanding distortion specifications:
- THD+N -152dB (+20dBu, 1kHz, 22kHz BW, 600Ω)
- THD+N -148dB (+20dBu, 10kHz, 80kHz BW, 600Ω)
- distortion spectrum consists almost entirely of 2nd and 3rd harmonic
- no significant crossover distortion, even with 200Ω load
- no significant common mode distortion, even with very high source impedances
Impressive AC performance:
- 50V/µs slew rte, highly symmetrical
- 95MHz gain bandwidth product
- 700kHz power bandwidth (20Vpp into 600Ω)
- 300kHz power bandwidth (20Vpp into 200Ω)
Superior DC precision:
- offset 10µV
- input bias current +-60nA
- input offset current +-10nA
Excellent load driving capability:
- 27Vpp(+21.8dBu) in 200Ω (+-15V supply)
- 20Vpp(+19.2dBu) in 100Ω (+-15V supply)
- 10Vpp(+13.2dBu) in 50Ω (+-15V supply)
- adjustable class A output current, factory trimmed to 30mA
- very low output impedance
- extensive short-circuit protection
Salient insensitivity to power supply deficiencies:
- very high PSRR with little degradtion towards high frequencies
- individual RC decoupling of amplifier sub-circuits eliminates the interaction of the various amplifier stages and makes the amplifier insensitive to power supply inductance
- high performance on-board decoupling capacitors, 2.4µF total
- no need for additional external decoupling capacitors
- recommended power supply range from +-5V to +-18V
Carefully thermal design:
- excellent stability of any bias condition
- full thermal isolation of the sensitive input stage from the power output stage
- fast settling of bias conditions after start up
Dimensions:
- 42 x 28 x 17mm (1.65 x 1.1 x 0.67 inches)
- API2520 standard pinout
Ackcheng
21 January
Very impressive data Kent!
But why 8 of them? Is it a 8 channels DAC?
admin
21 January
It knocks me out………(cut thousands of words about what should be a perfect gain/amp stage).
It is a stereo DAC, each channel has full balanced + and – phases signal path.
Left+/Left- & Right+/Right- This requires 4 amp modules.
In Medea+, OP1-BP works for 2 different roles:
1) I/V conversion
2) Output driver
Both (1) and (2) are taken care by 4 OP1-BP individually. Therefore there are total of 8 modules. I can tell you these really are the best one can find.
We discussed ESS9018 uses multi channels summing for better stereo performances. This leads to a much higher demand and critical on the analogue section. I have to say it once again Daniel Weiss and Samuel Groner are genius!
ackcheng
21 January
Looking at the impressive measurement data. This is definitely the best module on earth!
cowonice
21 January
Too expensive to afford yet still feel happy and exciting to see the progress of improving digital playback. So the very rich audiophiles will be using digital DACs much more expensive than what the top studio guys use, right? BTW, it will be really exciting to have a head-to-head of Medea Plus Vs DAC202 or DCS or EMM Lab!